* {
  margin: 0;
  padding: 0;
  list-style: none;
  box-sizing: border-box;
}
.warp {
  width: 100%;
  height: auto;
  background-color: cornflowerblue;
}
.warp .lan {
  width: 1000px;
  height: 30px;
  background-color: cornflowerblue;
}
.warp .lan .tu {
  width: 200px;
  height: 30px;
  background-color: cornflowerblue;
  float: left;
}
